Whether you are worried about vandals damaging your property, kids wandering into your estate and getting hurt, or just people generally getting in the way, here are some tips for keeping the public off your industrial estate. 
First, you should always have fencing around your industrial estate. This should solve almost all of your problems with people getting in when you don’t want them there. Industrial fencing is high quality, sturdy fencing that will keep out people and animals. Wire fencing is also durable and readily available.
Next, make sure that you have a sold gate in the industrial fencing, and that the lock you choose is secure and nearly impossible to open without a code or key. If a vandal wants to get in, they may have tools to do so, but this will keep the general public out.
To keep out vandals and thieves, it’s wise to install security cameras. Placing a camera by the gate of your estate is wise, but it may be good to place some along the wire fencing in other places as well. You can also put up signs warning people that they are under CCTV surveillance, and that any theft or vandalism will be prosecuted. This kind of warning generally deters the majority of troublemakers.
You can also install alarm systems, and be sure that your local police force and fire department area aware of your location and that your estate’s address is up to date and current in the phone book and online.
Finally, make sure that only the appropriate people have access to the estate. Never give out extra keys unless you know exactly why someone needs one. Warn everyone that they are not to make copies of keys without your permission.
Once you have put these precautions into motion, you should have little to no trouble with the public invading your estate.